package lesson3;
public class Demo_307 {
    public static void main(String[] args) throws InterruptedException {
        Counter307 counter = new Counter307();
        Counter307 counter1 = new Counter307();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter.increase();
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                counter1.increase();
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.count);
    }
}

class Counter307{
    public static int count = 0;
    private static Object locker = new Object();
    public  void increase(){
        synchronized(locker){    // 所当前对象
            count++;
        }
    }
}
